Yes, Vanguard offers VTI (0.04%) and Schwab offers SCHB (0.03%) which are also total stock market, but ETFs. In theory, the impact of fees would add up like this:

Fidelity 0.00%, 20 yrs: -0.0%, 40 yrs 0.0%

Schwab 0.03%, 20 yrs: -0.6%, 40 yrs -1.2%

Vanguard 0.04%, 20 yrs: -0.8%, 40 yrs - 1.6%

The compounding doesn't seem to make much difference from just multiplying. But if you compare VTI and SCHB performance each quarter, you would expect Schwab to pull ahead by +0.01% overall. But some quarters Vanguard is ahead, some quarters Schwab is ahead. So at slight differences, it might matter less than other factors.

Maybe number of stocks is a factor, since Schwab has ~2500 while Vanguard has ~3700. But if that's the case, Fidelity would be comparable to Schwab since it also holds ~2500 stocks. I think it will be interesting to compare the performance of all three, but I wouldn't sell taxable investments to save less than 1% over 20 years.